Add instrumentation for Downloads

[findmyway]

No description provided.

[codecov]

Codecov Report

Merging #43 (5452b01) into master (609749a) will increase coverage by 1.97%.
The diff coverage is 89.74%.

@@            Coverage Diff             @@
##           master      #43      +/-   ##
==========================================
+ Coverage   83.67%   85.65%   +1.97%     
==========================================
  Files          38       40       +2     
  Lines         870      899      +29     
==========================================
+ Hits          728      770      +42     
+ Misses        142      129      -13     

Impacted Files	Coverage Δ
src/sdk/src/metric/meter_provider.jl	83.58% <ø> (ø)
src/uber/test/runtests.jl	0.00% <0.00%> (ø)
...loads/src/OpenTelemetryInstrumentationDownloads.jl	93.33% <93.33%> (ø)
...ation/base/src/OpenTelemetryInstrumentationBase.jl	100.00% <100.00%> (ø)
src/sdk/src/trace/span.jl	90.56% <100.00%> (+13.29%)	⬆️
src/uber/src/OpenTelemetryUber.jl	100.00% <100.00%> (ø)
.../prometheus/src/OpenTelemetryExporterPrometheus.jl	70.00% <0.00%> (+5.00%)	⬆️
src/api/src/trace/tracer_basic.jl	97.14% <0.00%> (+5.96%)	⬆️
src/api/src/trace/tracer_provider.jl	69.73% <0.00%> (+10.52%)	⬆️

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